All experience counters are identical, no matter how you got them. For example, Ezuri, Claw of Progress's last ability will count experience counters that you got from the first ability, from another ability, from proliferating, and so on. [3]

Mizzix of the Izmagnus - Legendary Creature — Goblin WizardWhenever you cast an instant or sorcery spell with converted mana cost greater than the number of experience counters you have, you get an experience counter.Instant and sorcery spells you cast cost less to cast for each experience counter you have.

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